I have tried RT7Lite but if SP1 is being sliptreamed the Windows Live Essentials 2011 is not installing properly and after installation it is showing error , while trying to open any of its sub program.
Right now RT7Lite only support .msu file , but for Windows Live Essentials 2011 there is no .msu installer available.

I have successfully integrated IE9 into x86/x64 ISO but there is a bug where it will constantly open the welcome screen everytime IE9 is launched. I found a registry hack, but how do I automate it so that IE9 welcome message only shows up once?

4. Right click on the right pane and select New > DWORD (32-bit) Value.

5. Give it a value DisableFirstRunCustomize.

6. Now right-click on it and choose “Modify”.

7. Modify its DWORD (32-bit) Value to “1” from “0” and click OK.

8. Exit the Registry Editor.

Note: If you follow the Group Policy Editor method, the settings will be applied to all the users accounts, where as if you follow the Registry Editor method, the settings will effect only the currently logged in user account.